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Agent skill

Corvus Typescript Evaluator

by corvus-dotnet in corvus-dotnet/Corvus.JsonSchema

Work on the TypeScript port of the V5 standalone schema evaluator (src-ts/corvus-json-schema, npm package @corvus-dotnet/json-schema): loader, compiler, JavaScript code generator, results collector…

Apache-2.0Auto-check passedDevelopment

Install Corvus Typescript Evaluator

skills CLI
$ npx skills add corvus-dotnet/Corvus.JsonSchema --skill corvus-typescript-evaluator -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install corvus-dotnet/Corvus.JsonSchema corvus-typescript-evaluator --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/corvus-dotnet/Corvus.JsonSchema.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.github/skills/corvus-typescript-evaluator .claude/skills/corvus-typescript-evaluator && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
corvus-typescript-evaluator
GitHub stars
199
Token cost
~1.3k tokens
SKILL.md length
489 words
Files
1
Skills in repo
26
Repo updated
First seen
Licence
Apache-2.0

At a glance

Work on the TypeScript port of the V5 standalone schema evaluator (src-ts/corvus-json-schema, npm package @corvus-dotnet/json-schema): loader, compiler, JavaScript code generator, results collector…

  • Debugging the TypeScript evaluator
  • SKILL.md covers Overview, Build and test, Releasing to npm and Performance work, plus 2 more sections
  • Calls npm, node and git; needs GITHUB_TOKEN
  • Measuring it against jsu-js

What it does

Corvus Typescript Evaluator is an agent skill from corvus-dotnet/Corvus.JsonSchema. Work on the TypeScript port of the V5 standalone schema evaluator (src-ts/corvus-json-schema, npm package @corvus-dotnet/json-schema): loader, compiler, JavaScript code generator, results collector and annotations, conformance and annotation suites, the jsonschema-benchmark and Bowtie integrations, and performance measurement. USE FOR: changing or debugging the TypeScript evaluator, measuring it against jsu-js, running its Bowtie harness, keeping it in parity with the C runtime evaluator. DO NOT USE FOR: the C…

Its SKILL.md is about 1.3k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Development, covering Project scaffolding. It works with TypeScript, C#, npm and .NET. The repository describes itself as: Support for Json Schema validation and entity generation. The licence is Apache-2.0.

When your agent uses it

  • Debugging the TypeScript evaluator
  • Measuring it against jsu-js
  • Running its Bowtie harness
  • Keeping it in parity with the C runtime evaluator

Example prompts

  • “/corvus-typescript-evaluator”

Requirements

  • A credential in GITHUB_TOKEN

What it can do on your machine

Read from SKILL.md and the folder at commit b9e3040. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • npm
    • node
    • git

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Links to these hosts (documentation or services it may open):

    • github.com

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names these keys or tokens, usually read from environment variables:

    • GITHUB_TOKEN

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Corvus Typescript Evaluator loads about 1.3k tokens when it runs. Until then it costs about 168 tokens; SKILL.md has 489 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~168
When it runs · the whole SKILL.md, loaded when a task matches
~1.3k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from corvus-dotnet/Corvus.JsonSchema at commit b9e3040, republished under its Apache-2.0 licence (© corvus-dotnet). 489 words, ~1,257 tokens.

Download SKILL.mdSave it as .claude/skills/corvus-typescript-evaluator/SKILL.md (or your agent's skills folder).
name
corvus-typescript-evaluator
description
Work on the TypeScript port of the V5 standalone schema evaluator (src-ts/corvus-json-schema, npm package @corvus-dotnet/json-schema): loader, compiler, JavaScript code generator, results collector and annotations, conformance and annotation suites, the jsonschema-benchmark and Bowtie integrations, and performance measurement. USE FOR: changing or debugging the TypeScript evaluator, measuring it against jsu-js, running its Bowtie harness, keeping it in parity with the C# runtime evaluator. DO NOT USE FOR: the C# runtime evaluator itself (see corvus-standalone-evaluator and docs/RuntimeEvaluator.md), .NET code generation (corvus-codegen).

TypeScript Standalone Evaluator

Overview

src-ts/corvus-json-schema ports the Corvus.Text.Json.RuntimeEvaluator pipeline to TypeScript. The loader, compiler and analyses mirror the C# SchemaLoader/SchemaCompiler; instead of interpreting fused plans, the code generator emits one specialised JavaScript function per node (codegen.ts) and instantiates the program with new Function, or emits a standalone ES module (generateModule). Results collection (results.ts, collecting.ts) interprets the same node graph and reproduces the C# JsonSchemaResultsCollector rows. The package README (src-ts/corvus-json-schema/README.md) describes the design and the known differences from C#.

Build and test

Node 22 or later. From src-ts/corvus-json-schema:

bash
npm ci
npm test    # unit tests, the suite via compile(), via generateModule(), via a verbose collector,
            # the annotation suite, and the Bowtie IHOP driver

The suites read the repository's JSON-Schema-Test-Suite submodule (git submodule update --init JSON-Schema-Test-Suite). Every required, optional and format test must pass (draft4/optional/zeroTerminatedFloats.json is excluded, as in the C# runner), and all annotation assertions.

src/metaschemas.ts is generated from src/Corvus.Text.Json/metaschema by npm run embed-metaschemas; CI fails if it is stale.

Releasing to npm

The package is versioned independently of the NuGet packages, with its own history in src-ts/corvus-json-schema/VERSIONHISTORY.md (packed with it). Bump version in package.json, add the version's entry at the top of VERSIONHISTORY.md in the style of the repository's VERSIONHISTORY.md, and merge to main; .github/workflows/npm-publish.yml runs the tests, stages the version if npm doesn't have it (npm stage publish through npm trusted publishing: the package's trusted publisher on npmjs.com names that workflow file, so don't rename it, and allows only staging), and tags the commit ts-v<version>. A maintainer then approves the staged version with 2FA (Staged Packages tab on npmjs.com, or npm stage approve <stage-id>); CI cannot publish a version on its own. Packing runs prepack, which builds dist/ and copies the repository LICENSE into the package. CI fails if npm pkg fix would change package.json, because npm 11 silently drops fields it auto-corrects when publishing (write bin paths without a leading ./).

Never push a ts-v tag (or any non-version tag) by hand: build.yml publishes NuGet packages for the tags that trigger it. Its tag filter only accepts release versions ([0-9]+.[0-9]+.[0-9]+*), and the workflow's own tag push uses GITHUB_TOKEN, which starts no other workflow.

Show full SKILL.md (160 more words)Show less

Performance work

  • Corpora: clone https://github.com/sourcemeta-research/jsonschema-benchmark and run node bench/corpora.mjs --schemas <clone>/schemas [--jsu <dir>] (see bench/README.md for the jsu-js setup).
  • One corpus: node bench/loop.mjs <clone>/schemas/<name> 3 (fastest pass); add --cpu-prof to profile, and DUMP=out.js to write the generated source.
  • Compile phases: node bench/compile-phases.mjs <schema.json>.
  • Measure before and after on the same machine, interleaving the two builds (a git worktree of the base commit with its own dist/ works well). Heuristic thresholds are environment variables (CORVUS_TS_UNROLL, CORVUS_TS_SWITCH, CORVUS_TS_UNROLL_REQUIRED, CORVUS_TS_EAGER_MAX, CORVUS_TS_DISPATCH_MAP) for A/B runs.
  • Results collection must not affect flag-mode times: flag mode runs only generated code.

Parity with the C# evaluator

When the C# collecting mode changes (paths, messages, row order, which subschema results are kept), update collecting.ts and test/results.test.mjs, which reproduces the C# ResultsTests/ResultPathTests expectations. Format recognition follows SchemaCompiler.GetFormatKind (formatKind in formats.ts).

Integrations

  • bench/jsonschema-benchmark/: the implementations/corvus-ts directory for jsonschema-benchmark (main.mjs prints cold,warm,compile,parse in nanoseconds; Makefile.fragment holds the Makefile rules).
  • bowtie/: the implementations/js-corvus-jsonschema harness for Bowtie; node test/bowtie-ihop.mjs drives it without containers.

© corvus-dotnet, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in .github/skills/corvus-typescript-evaluator of corvus-dotnet/Corvus.JsonSchema.

Open the folder on GitHubat commit b9e3040

Compare with similar skills

Corvus Typescript Evaluator next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Corvus Typescript Evaluator compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Corvus Typescript Evaluator this skillcorvus-dotnet/Corvus.JsonSchema199—~1.3kAutomated safety check: PassApache-2.0
Git HooksProrise-cool/Claude-Code-Multi-Agent305—~3.6kAutomated safety check: NotesNone
Eslintmanagedcode/dotnet-skills486—~1.5kAutomated safety check: PassMIT
Htmlhintmanagedcode/dotnet-skills486—~1.2kAutomated safety check: PassMIT
Webhintmanagedcode/dotnet-skills486—~1.3kAutomated safety check: PassMIT
Stylelintmanagedcode/dotnet-skills486—~1.7kAutomated safety check: PassMIT

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Works with

Categories

Questions about Corvus Typescript Evaluator

What does Corvus Typescript Evaluator do?

Work on the TypeScript port of the V5 standalone schema evaluator (src-ts/corvus-json-schema, npm package @corvus-dotnet/json-schema): loader, compiler, JavaScript code generator, results collector…. JsonSchema. Work on the TypeScript port of the V5 standalone schema evaluator (src-ts/corvus-json-schema, npm package @corvus-dotnet/json-schema): loader, compiler, JavaScript code generator, results collector and annotations, conformance and annotation suites, the jsonschema-benchmark and Bowtie integrations, and performance measurement.

When should I use Corvus Typescript Evaluator?

Corvus Typescript Evaluator fits situations like: debugging the TypeScript evaluator; measuring it against jsu-js; running its Bowtie harness; keeping it in parity with the C runtime evaluator.

How do I install Corvus Typescript Evaluator in Claude Code?

Run `npx skills add corvus-dotnet/Corvus.JsonSchema --skill corvus-typescript-evaluator -a claude-code`. Or copy the skill folder (.github/skills/corvus-typescript-evaluator in corvus-dotnet/Corvus.JsonSchema) into .claude/skills/corvus-typescript-evaluator in your project. Claude Code loads it when a task matches its description.

How do I install Corvus Typescript Evaluator in Codex?

Run `npx skills add corvus-dotnet/Corvus.JsonSchema --skill corvus-typescript-evaluator -a codex`. Or copy the skill folder (.github/skills/corvus-typescript-evaluator in corvus-dotnet/Corvus.JsonSchema) into .agents/skills/corvus-typescript-evaluator in your project. Codex loads it when a task matches its description.

Can I use Corvus Typescript Evaluator in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add corvus-dotnet/Corvus.JsonSchema --skill corvus-typescript-evaluator -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/corvus-typescript-evaluator, .gemini/skills/corvus-typescript-evaluator, .github/skills/corvus-typescript-evaluator and .opencode/skills/corvus-typescript-evaluator in your project.

What does Corvus Typescript Evaluator need to run?

Going by SKILL.md and its folder, Corvus Typescript Evaluator needs the command-line tools its instructions call (npm, node and git) and credentials named GITHUB_TOKEN. Our summary lists: A credential in GITHUB_TOKEN.

Does Corvus Typescript Evaluator access the network?

SKILL.md names 1 domain. As links in the text: github.com. This is read from the text; nothing was executed.

Is Corvus Typescript Evaluator safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Corvus Typescript Evaluator use?

Corvus Typescript Evaluator is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Corvus Typescript Evaluator use?

About 1.3k tokens (SKILL.md is roughly 5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Corvus Typescript Evaluator?

Skills that share tags, products or a category with Corvus Typescript Evaluator: Git Hooks (Prorise-cool/Claude-Code-Multi-Agent, 305 stars), Eslint (managedcode/dotnet-skills, 486 stars), Htmlhint (managedcode/dotnet-skills, 486 stars) and Webhint (managedcode/dotnet-skills, 486 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Corvus Typescript Evaluator?

corvus-dotnet (a GitHub organization) maintains it in corvus-dotnet/Corvus.JsonSchema, which has 199 GitHub stars. The repository holds 26 skills in this directory. The repository was last updated on October 8, 2026.

Source: corvus-dotnet/Corvus.JsonSchema on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.